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Initially there were no trains running on the GWR line towards London from Reading Station.

The problems were then made worse when South Western Railway, which provides services to London Waterloo, announced a signal failure between Reading, Berkshire, and Wokingham was also going to cause problems.

This led to the crammed trains, as people tried to make their way to London using the alternative route, going much slower than normal.

Later in the morning, SWR also had to cancel some services.

Pictures showed hundreds of commuters at Reading Station waiting to get on SWR's services.

Great Western Railway confirmed three of the four lines around Paddington that were closed reopened at around 11.30am but problems were still expected for the rest of the day.